Self Stirring Quality Work Novelty Office Mug Coffee Cup Gift This unique 12-oz. stainless steel mug stirs and mixes your coffee, soup packets or hot chocolate with the press of a button. Quality made of double-wall stainless steel with polypropylene inner liner, each mug features a powerful 4,000-RPM motor that efficiently and quietly blends without need for a spoon. 12 oz Capacity Stainless Steel Construction with Double Wall Polypropylene Liner Large Comfortable Grip with Push Button Activation Switch